ToolBarButton.DropDownMenu 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

來源:

ToolBarButton.cs

設定選單顯示在下拉工具列按鈕中。

public:
 property System::Windows::Forms::Menu ^ DropDownMenu { System::Windows::Forms::Menu ^ get(); void set(System::Windows::Forms::Menu ^ value); };

[System.ComponentModel.TypeConverter(typeof(System.ComponentModel.ReferenceConverter))]
public System.Windows.Forms.Menu DropDownMenu { get; set; }

[<System.ComponentModel.TypeConverter(typeof(System.ComponentModel.ReferenceConverter))>]
member this.DropDownMenu : System.Windows.Forms.Menu with get, set

Public Property DropDownMenu As Menu

屬性值

Menu

ContextMenu A會顯示在下拉工具列按鈕中。 預設值為 null。

屬性

TypeConverterAttribute

例外狀況

ArgumentException

被指派的物件不是 ContextMenu。

範例

以下程式碼範例建立了 a ToolBar 和三個 ToolBarButton 控制項，將按鈕指派到工具列，並設定按鈕的共同屬性。 此程式碼要求ImageList已建立 ImageList 、且 Form 至少指派一個 Image 。 ToolTip

public:
   void InitializeMyToolBar()
   {
      // Create the ToolBar, ToolBarButton controls, and menus.
      ToolBarButton^ toolBarButton1 = gcnew ToolBarButton( "Open" );
      ToolBarButton^ toolBarButton2 = gcnew ToolBarButton;
      ToolBarButton^ toolBarButton3 = gcnew ToolBarButton;
      ToolBar^ toolBar1 = gcnew ToolBar;
      MenuItem^ menuItem1 = gcnew MenuItem( "Print" );
      array<MenuItem^>^ temp1 = {menuItem1};
      System::Windows::Forms::ContextMenu^ contextMenu1 =
         gcnew System::Windows::Forms::ContextMenu( temp1 );
      
      // Add the ToolBarButton controls to the ToolBar.
      toolBar1->Buttons->Add( toolBarButton1 );
      toolBar1->Buttons->Add( toolBarButton2 );
      toolBar1->Buttons->Add( toolBarButton3 );
      
      // Assign an ImageList to the ToolBar and show ToolTips.
      toolBar1->ImageList = imageList1;
      toolBar1->ShowToolTips = true;
      
      /* Assign ImageIndex, ContextMenu, Text, ToolTip, and 
         Style properties of the ToolBarButton controls. */
      toolBarButton2->Style = ToolBarButtonStyle::Separator;
      toolBarButton3->Text = "Print";
      toolBarButton3->Style = ToolBarButtonStyle::DropDownButton;
      toolBarButton3->ToolTipText = "Print";
      toolBarButton3->ImageIndex = 0;
      toolBarButton3->DropDownMenu = contextMenu1;
      
      // Add the ToolBar to a form.
      Controls->Add( toolBar1 );
   }

public void InitializeMyToolBar()
 {
    // Create the ToolBar, ToolBarButton controls, and menus.
    ToolBarButton toolBarButton1 = new ToolBarButton("Open");
    ToolBarButton toolBarButton2 = new ToolBarButton();
    ToolBarButton toolBarButton3 = new ToolBarButton();
    ToolBar toolBar1 = new ToolBar();
    MenuItem menuItem1 = new MenuItem("Print");
    ContextMenu contextMenu1 = new ContextMenu(new MenuItem[]{menuItem1});

    // Add the ToolBarButton controls to the ToolBar.
    toolBar1.Buttons.Add(toolBarButton1);
    toolBar1.Buttons.Add(toolBarButton2);
    toolBar1.Buttons.Add(toolBarButton3);
 
    // Assign an ImageList to the ToolBar and show ToolTips.
    toolBar1.ImageList = imageList1;
    toolBar1.ShowToolTips = true;
 
    /* Assign ImageIndex, ContextMenu, Text, ToolTip, and 
       Style properties of the ToolBarButton controls. */
    toolBarButton2.Style = ToolBarButtonStyle.Separator;
    toolBarButton3.Text = "Print";
    toolBarButton3.Style = ToolBarButtonStyle.DropDownButton;
    toolBarButton3.ToolTipText = "Print";
    toolBarButton3.ImageIndex = 0;
    toolBarButton3.DropDownMenu = contextMenu1;
 
    // Add the ToolBar to a form.
    Controls.Add(toolBar1);
 }

Public Sub InitializeMyToolBar()
    ' Create the ToolBar, ToolBarButton controls, and menus.
    Dim toolBarButton1 As New ToolBarButton("Open")
    Dim toolBarButton2 As New ToolBarButton()
    Dim toolBarButton3 As New ToolBarButton()
    Dim toolBar1 As New ToolBar()
Dim menuItem1 As New MenuItem("Print")
Dim contextMenu1 As New ContextMenu(New MenuItem(){menuItem1})
    
    ' Add the ToolBarButton controls to the ToolBar.
    toolBar1.Buttons.Add(toolBarButton1)
    toolBar1.Buttons.Add(toolBarButton2)
    toolBar1.Buttons.Add(toolBarButton3)
    
    ' Assign an ImageList to the ToolBar and show ToolTips.
    toolBar1.ImageList = imageList1
    toolBar1.ShowToolTips = True
    
    ' Assign ImageIndex, ContextMenu, Text, ToolTip, and
    ' Style properties of the ToolBarButton controls. 
    toolBarButton2.Style = ToolBarButtonStyle.Separator
    toolBarButton3.Text = "Print"
    toolBarButton3.Style = ToolBarButtonStyle.DropDownButton
    toolBarButton3.ToolTipText = "Print"
    toolBarButton3.ImageIndex = 0
    toolBarButton3.DropDownMenu = contextMenu1
    
    ' Add the ToolBar to a form.
    Controls.Add(toolBar1)
End Sub

備註

你可以指定在點擊下拉按鈕時顯示的 。ContextMenu 除非屬性值設為 ToolBarButtonStyle.DropDownButton，否則Style此屬性不會被使用。

備註

雖然 DropDownMenu 屬性被定義為型 Menu 別，但你必須指派它 a ContextMenu 才能正確顯示。 如果你要建立自己的 MenuItem 衍生類別，你必須將該物件指派給 a ContextMenu ，並將 指 ContextMenu 派給 DropDownMenu 屬性。

另請參閱

• MenuItem